feat: gains supervisory packages (#18) #17

Job	Run time
R Package Checks / lintr / lint	1m 26s
R Package Checks / codecov / test-coverage	1m 16s
R Package Checks / docs-check / docs-check	1m 13s
R Package Checks / check-R-updates / updated-files	0s
R Package Checks / r-cmd-check / macOS-latest (release)	3m 22s
R Package Checks / r-cmd-check / windows-latest (release)	5m 44s
R Package Checks / r-cmd-check / windows-latest (3.6)	3m 49s
R Package Checks / r-cmd-check / windows-latest (4.1)	4m 28s
R Package Checks / r-cmd-check / ubuntu-latest (release)	1m 24s
R Package Checks / r-cmd-check / ubuntu-latest (devel)	1m 32s
R Package Checks / r-cmd-check / ubuntu-latest (oldrel-1)	2m 1s
R Package Checks / r-cmd-check / ubuntu-latest (oldrel-2)	1m 36s
R Package Checks / r-cmd-check / ubuntu-latest (oldrel-3)	2m 0s
R Package Checks / r-cmd-check / ubuntu-latest (oldrel-4)	2m 2s
R Package Checks / version-check	0s
	31m 53s

Provide feedback